The name Roscommon is derived from Coman mac Faelchon who built a monastery there in the 5th century. The woods near the monastery became known as Ros Comáin (St. Coman's Wood). This was later anglicised to Roscommon.

Its population at the 2006 census was 5,017 (including rural area). Despite the town itself having a relatively small population, it caters to a large fraction of the population of County Roscommon as Castlerea and Boyle are the only other major towns in the county.

Loughnaneane Park is situated in the town centre, behind the old gaol. It contains a children's playground, outdoor exercise equipment, a lakeside walkway, picnic tables, and Roscommon Castle.

Mote Park, the former estate of the Crofton landlord family, approximately 1.6 km (0.99 mi) from the town centre is a woodland area covering several miles and is popular with walkers.[3]

Roscommon Golf Club was founded in 1904, the course, set in parklands filled with mature sycamore, beech, whitethorn trees and ash trees, was extended to eighteen holes in 1996 and now measures 6,390 meters (6,990 yards).[4]

Roscommon Racecourse is a horse racing course, which is situated approximately 1.6 km (0.99 mi) from the town centre, the track itself is an oblong right-handed track 2 km (1.2 mi) in length, and the course has stabling for up to 95 horses.[6]

Roscommon Leisure Centre opened early 2002 and has a 25 m (82 ft) deck level pool with a learner swimming pool and spectator gallery and fully equipped gymnasium.[7] Situated next to the swimming pool is the home of Roscommon's most successful sport — St Coman's handball club. Established in 1930 the club has produced many All-Ireland winning handballers and one world ladies junior champion handballer.

Roscommon Castle is located on a hillside just outside the town. Now in ruins, the castle is quadrangular in shape, it had four corner D-shaped towers, three storeys high, and twin towers at its entrance gateway, one of which still retains its immensely sturdy vaulted roof. The entire castle was enclosed by a lofty curtain wall. It was built in 1269 by Robert de Ufford, Justiciar of Ireland, on lands he had seized from the AugustinianPriory.[8] The castle had a most chequered history. It was besieged by Connacht King Aodh Ó Conchobhair in 1272.

Eight years later it was again in the hands of an Englishgarrison, and fully repaired. By 1340 the O'Connor's regained possession of it, and, except for a few brief intermissions, they held it for two centuries until 1569, when Sir Henry Sidney, Lord Deputy seized it. It was granted to Sir Nicholas Malbie, Elizabethan Governor of Connaught, in 1578. Two years later the interior was remodeled and large mullioned windows were inserted in the towers and curtain walls. Again, in 1641 the Parliamentarian faction gained it until Confederate Catholics under Preston captured it in 1645.

It remained in Irish hands until 1652 when it was partially blown up by Cromwellian "Ironsides" under Commissary Reynolds, who had all the fortifications dismantled. It was finally burned down in 1690, and, from the closing years of the 17th-century, it gradually fell into decay. A symmetrical moat some distance from the curtain walls surrounded the entire castle and safeguarded it. It is now a national monument.[9]

Harrison Hall, which houses the Bank of Ireland

Harrison Hall is located prominently in the market square and is now occupied by the Bank of Ireland. Most of the ground floor is open to the public. Once a 17th-century sessions house, it was remodeled in 1762 by Sir William Morrison and converted into a court house and market house. It is built in the classical architectural style with a cupola. It became a catholic church in 1863. After 1903 it became a recreational hall to commemorate Dr John Harrison (who was a physician in Roscommon town's workhouse, during the famine of the 1840s) it was used as a dance hall, cinema and theatre before it was sold to the Bank of Ireland in 1972.

Old Gaol is the second most prominent building in the town and faces the back of the Bank of Ireland now houses a modern shopping centre, the facade is all that remains of the original structure. The original building is thought to have been designed by Richard Cassells in 1736. The gaol had the distinction of having a hang woman 'Lady Betty', a criminal who had her sentence withdrawn on the provision that she perform the unpaid task of hang woman. In 1822 it was taken over for use as a lunatic asylum. In 1833 it became a 'Lazaretto' – a place where outcasts who suffered from smallpox were confined. Sometime after 1840 the building was converted to residential and commercial use.[10]

County Museum and Tourism Office is located next to Harrison hall in the town square. It was originally a small Presbyterian church built in 1863. The building is of cut limestone with a large recessed door, circular headed windows and fenestration on the wheel window over the door is in the form of the 'Star of David' to commemorate its Welsh Builders. The building was renovated in 1991 and now contains many exhibits and artifacts illustrating and interpreting the history of Roscommon. Among the artifacts on display are a 9th-century grave slab from St Comans Abbey and a Sheela na Gig from Rahara church.

St. Coman's Church

Roscommon Abbey is on the outskirts of the core of the town, and is reachable by a path at the back of the Abbey Hotel running alongside the Abbey boys' school. It was founded just over 750 years ago by King Felim O'Connor (Irish: Fedlimid Ó Conchobair) of Connacht, who was buried there himself in 1265. The effigy in a niche on the north side of the chancel is either that of himself (but carved 35 years or more after his death), or of one of his successors; dating from around 1300, it shows a king dressed in a long robe and mantle of a kind that suggests he may have been aping an English regal costume of the period, an idea supported by the fact that he carries a sceptre with fleur-de-lis head in his right hand. The tomb front supporting his effigy slab (but not originally belonging to it) bears eight niches containing fifteenth-century carved figures of gallowglasses, mercenaries of Scottish origin who played a major role in Irish wars of the Later Middle Ages. These have their bodies protected by a coat of mail and each wears a helmet known as a bascinet. All are armed with a sword, except one who bears an axe-like sparth, a typical gallowglass weapon.

Usually called the 'Abbey', it is more accurately described as a friary, it was created for Dominican friars. During the course of its existence, it experienced many misfortunate events, starting with a fire in 1270, a lightning-strike in 1308, and having Lord Audley take large sums of money deposited in it by the poor people of the town for the use of his army against a king of Connacht. But the main part of the church must have survived these misfortunes, for much of its existing fabric dates from the thirteenth century, as seen in the style of the lancet windows in the north and south walls. The east wall of the church probably had five such windows grouped and graded together, but they were replaced in the fifteenth century by one single large traceried window which probably shed more light inside during the morning. At the same period, a chapel — also with a large window — was added to the north, at right angles to an aisle which is separated from the nave by an arcade supported by round columns which still partially survive. Suppressed at the Reformation, the ruined buildings were denuded of their majestic tower, and probably also of the cloister to the south, when they served as a handy stone-quarry for their owner.[11]

Roscommon County Library is situated in Abbeytown opposite the CBS secondary school. It was built in 1783 as an Infirmary. It is a 3-storey over basement limestone structure. Two symmetrical wings flank the north and south end of a central portion. It was used as a hospital until 1941. Major reconstruction work was undertaken in 1989 and the building was refitted as the County Library.[12]

Sacred Heart Catholic Church dominates the skyline of the town. The church spire is 52 m high. Built of local cut stone and opened in 1903, it was completed in 1925. The church is built on rising ground and fronted by a sunken grotto. Over the main door is a fine example of mosaic, carried out by the Italian firm of Salviate, depicting two bishops of the diocese of Elphin connected with the building of the church. The interior is equally impressive and contains a replica of the Cross of Cong. This wonderful example of Irish Craftsmanship was made in Fuerty between 1120 - 1123.[13]

Sacred Heart Home, a former workhouse, is situated on the outskirts of the town approximately 500m from the town on the golf links/ Curraghboy road. Outside this building is an Irish Famine Memorial. It was constructed on behalf of the people of Roscommon in 1999, as a permanent memorial to the thousands of Roscommon people who perished in the Famine. It is built next to the master's residence of the Workhouse. The workhouse building was constructed in 1840, in response to a sudden increase in extreme poverty and famine in the Roscommon town area. Roscommon was severely affected during the great famine, with one of the highest death rates per population recorded in the whole of Ireland, during this period the population of Roscommon suffered a 31.5% drop. The work house was designed for 700 paupers but housed up to 1,600 people during the famine years.[14]

Hundreds flocked to the workhouse for sustenance and refuge. However, the workhouse could not cope with the numbers requiring assistance. This situation was reflected in a notice which was posted outside Roscommon Workhouse in January 1847, which stated that no new applicants seeking assistance could be admitted. Many who died there were buried in Bully's Acre, a short distance away.

Roscommon Lamb Festival takes place on the first weekend of May each year (the May bank holiday weekend). Its aim is to highlight the quality of locally produced food and entails diverse events and activities, including barbecues, craft sales and novelty events.[15]

Roscommon town has three primary schools, and three secondary schools some of which also offer post-leaving cert courses. The three primary schools are Scoil Mhuire Primary School, Abbey National School and Gaelscoil de híde. The Convent of Mercy, The Christian Brothers Secondary School and Roscommon Community College are the secondary schools. Most of the schools in the town are located near each other, and are easily accessible. Gaelscoil de híde is located on the Galway Road and is 1.7km from town. Roscommon Community College is located 1.3km from the town.

LC1265.6 Fedhlim, son of Cathal Crobhderg Ó Conchobhair, king of Connacht—the protector and supporter of his own province, and the protector of his friends on every side; the plunderer and extirpator of his enemies wherever they might be; a man full of bounty and prowess; a man full of distinction and honor in Erinn and Saxon-land—died after the triumph of unction and penitence, and was interred in the monastery of the Friars Preachers in Ros-Comain, which he had previously granted to God and the Order.

LC1564.2 Ros-Comain was taken by the sons of Tadhg Og, son of Tadhg, son of Toirdhelbhach Ó Conchobhair, from Ó Conchobhair Donn; and they gave the town, after taking it, to Ó Conchobhair Ruadh, i.e. Tadhg Og, son of Tadhg Buidhe; and much was destroyed throughout all Connacht on account of this capture. Brian, son of Ruaidhri Mac Diarmada, and the sons of Tomaltach Mac Diarmada, with many men, went into ambush around Ros-Comain. Conchobhar, the son of Ó Conchobhair Ruadh, went out from the court that day, and the ambuscaders attacked himself and his people on all sides; and they were driven to the monastery and their horses were taken from them before the door; and they themselves went into the belfry. But this place was no defence to them. All followed them, and God decreed the termination of their lives; for, though strong the place in which they were; their heads were taken off them all. Conchobhar, son of Toirdhelbhach Ruadh Ó Conchobhair, was killed there, and ten and eleven of his people along with him; and horses were taken from them. On the Saturday of Patrick's Sunday these deeds were committed.